Adjustable pad holder



Jan. 21, 1941. N. H. MCRAE ETAL. 2,229,250

ADJUSTABLE PAD HOLDER Filed March l 25, 193e l L n E V f HLW r a qt Patented Jan. 21, 1941 errar orties ADJUSTABLE PAD HLDER y Norman E. McRae and Edwin V. Coulter,

St. Paul, Minn.

Application March 2-5, 1938, Serial No. 198,042

6 Claims.

Our invention relates to an improvement in adjustable pad holders wherein it is desired to provide a means of supporting a pad of steel wool or the like for rotation over a surface to be polished.

It has been common practice in the last few years to provide circular pads formed of steel wool and the like for the purpose of polishing surfaces such as oors'and other fiat areas. It has been common practice to support these pads beneath a rotary brush so that the bristles of the brush extend down into the pad to cause the pad to rotate with the brush Other supporting blocks have also been provided for the steel wool pads, but these blocks havebeen so designed that the means supporting the pad will contact the floor or the area to be polished before the pad is worn out. Accordingly, it has been necessary to use more pads than would otherwisev be necessary.

It is the purpose of the present invention to provide a holder for scouring or polishing pads formed of steel wool and the like, which holder is provided with a iiat under surface adapted to bear evenly upon the upper surface of the pad. Thus the pressure of the polishing device bears evenly upon the pad causing the same to wear down uniformly throughout its entire area. Thus the pad may be used until the same is worn extremely thin before it is necessary to discard the pad.

A further feature of our invention consists in the provision of a pad holding means having a flat lower surface which will bear evenly upon the surface of a pad and which will permit the pad to be reversed or inverted from time to time in the use of the same as desired. Thus as one surface of the pad wears down to a considerable extent and becomes matted together, the pad may be turned upside down and the opposite surface used as the scouring surface. Accordingly, the pad is not worn out until both surfaces of the same have been worn down.

It is a further feature of our invention to provide a holder for polishing pads having a series of pins adjustably extending therethrough. These pins are designed to extend into the body of the polishing pad to engage and cause rotation of the same. When a new polishing pad is being used, these pins may be adjusted to extend to a considerable extent into the body of the pad. However, as the pad Wears thinner and becomes more condensed, less force is necessary to cause rotation of the pad with the holder, and the pins need not extend quite as far into the body of the pad as was formerly desirable. Therefore, the

`one of the openings through the holder for the pins may be forced farther through the holder so that the portion projecting below the holder Ainto the pad will not be so long.

Figure 1 is a perspective view of our pad holder a0 in position upon a pad.

Figure 2 is a top plan View of our pad holder. Figure 3 is a cross-sectional View through the holder taken on the line 3-3 of Figure 2. v

Figure 4 is an enlarged sectional detail through adjustable pins showing a pin in place.

The holder A comprises a disc Iii having a lower continually flat surface Il. An annular bead I2 of increased thickness extends along the edge of the disc I ll. Radially extending ribs I3 join the circular bead I2 with the central hub portion I 4.

The central hub portion Ill is designed to fit the attaching means of any rotary floor surfacing machine. The particular construction shown is capable of tting one type of these machines. Each disc Il! is provided with the proper type of hub It to fit the floor surfacing machine upon which it is to be used.

In the form shown the hub I4 includes a cylindrical hollow sleeve I5 extending centrally upward from the disc Ill and having vertical bosses I6 extending upwardly in angularly spaced relationship. An attaching plate I'I is secured by screws I9 or by other suitable means to the sleeve I5 to enable the disc I0 to be supported by a floor surfacing machine.

Openings radially spaced along the ribs I3 extend through the ribs I3 and the disc I il. These openings 28 accommodate pins 2I which 't therein with a friction fit. The pins 2| are usually rounded in the lower end 22 and tapered slightly from the lower-most end thereof to a slightly smaller diameter at the upper extremity. When a new polishing pad B shown in Figures 1 and 4 of the drawing is being held by the holder A the pins 2l are allowed to extend to a considerable distance from the lower surface I I of the disc I0. As the pad B wears however, and mats together condensing the same, it is not necessary that the pins be so long, and they are therefore driven upwardly in the holes 20 until a shorter portion of the same extends from the lower surface of the disc.

Angularly positioned intermediate the radially extending ribs I3 we provide a pair of radially spaced bosses 23. These bosses 23 are provided with openings 24 therethrough through which pins 2l may be inserted if desired. For most types of pads and for most types of work it is not necessary to provide pins extending through the bosses 23. However, upon occasion it is extremely desirable to provide additional holding means, and accordingly, we provide the bosses 23 through which pins 2| maybe extended to provide additional holding power. It will be noted that the radial spacing of the holes 24 does not increase with the radial spacing of the holes 20 so that -in the rotation of the holder A and the pad B the pins 2| do not all exert force upon the pad at the same distance from the center, but this force is exerted at various radii from the center of the pad.

In accordance with the patent statutes we have described the principles of construction of our polishing pad holder, and while we have endeavored to set forth the best embodiment thereof, we desire to have it understood that this is only illustrative of a means of carrying out our invention and that obvious changes may be made Within the scope of the following claims without departing from the spirit of our invention.

We claim:

1. A holder for polishing pads comprising a disc having a continuously flat lower surface, a hub on said disc extending from the upper surface thereof designed for connection with a rotating means, a series of openings through said disc, and blunt tapered pins larger at one end and having this end extending downwardly extending through said openings designed to be embedded in a polishing pad to rotate the same with the holder.

2. A holder designed for use with a rotating means comprising a disc body, a series of holes extending through said body, round ended tapered pins of larger diameter at one end than at the other adjustably inserted in said holes from the bottom thereof, with the larger diameter end projecting downwardly, and hub means designed for connection with a rotating means.

3. A holder for polishing pads designed for use with a rotating means, said holder comprising a disc, a bead extending annularly about the upper surface of said disc, a central hub portion projecting from the upper surface of said disc, radially extending ribs extending from said hub to said bead, said ribs and disc having openings therethrough, and round ended tapered pins having their larger diameter end extending downwardly extending through said openings.

4. A holder for polishing pads adapted for use with a rotating means comprising a disc, a hub centrally secured thereto for connection with the rotating means, a series of radially extending ribs on the upper surface of said disc, said ribs and disc having openings therethrough, the openings through said ribs being at diierent distances from the center of said disc than the openings through said disc, and tapered pins forced in said openings from the bottom thereof.

5. A holder for polishing pads designed for use with a rotating means, said holder comprising a disc, a central hub portion, openings through said disc, tapered pins extending through said holes with the largest end of said pins extending downwardly therefrom, and rounded ends on said pins.

6. A holder for polishing pads comprising a disc, a means thereupon for connection with a rotary means, a series of angularly spaced radially extending reinforcing ribs on one surface of said disc, said ribs having radially spaced openings therethrough, bosses angularly spaced between said ribs, said bosses being radially spaced, said 'bosses having openings therethrough, the openings in said bosses being spaced at different distances from the center of said disc from the openings in said radially extending ribs, and tapered pins in said openings having their large diameter ends projecting below the other surface of said disc.

NORMAN H. MCRAE. EDWIN V. COULTER. 

